Solve (y^2-7)^2

$$( y ^ { 2 } - 7 ) ^ { 2 }$$

Expand

$$y^{4}-14y^{2}+49$$

Solution Steps

Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(y^{2}-7\right)^{2}.

$$\left(y^{2}\right)^{2}-14y^{2}+49$$

To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.

$$y^{4}-14y^{2}+49$$

Evaluate

$$\left(y^{2}-7\right)^{2}$$

Solution Steps

Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(y^{2}-7\right)^{2}.

$$\left(y^{2}\right)^{2}-14y^{2}+49$$

To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.

$$y^{4}-14y^{2}+49$$